George pi



(No Model.)

No. 524,468. Patented Aug. 14, 1894.

` Fl ca y UNITED STATES PATENT OFFICE.

GEORGE I-I.. RANDOLPH, OF COLORADO, ILLINOIS.

FURNACE came-BAR.

SFECIFICATION forming part of Letters Patent No. 524,468, dated August 14, 1894.

Application tiled October 23, 1893. Serial No. 488.936. (No model.) Y

To all wiz/m it may oon/cern:

Be it known that I, GEORGE H. RANDOLPH, a citizen of the United States, residing at Colorado, in the county of Pope and State of Illinois, have `invented a new and useful Furnace Grate-Bar, of which the following is a specification.

This invention relates to furnace grate bars; and it has for its object to provide certain improvements in hollow grate bars for steam boiler furnaces whereby simple and efficient means shall be provided for not only heating up the feed water pumped into the boiler, but at the same time provide for a constant cir` culation of Water through the grate bars and thereby greatly increase the life thereof.

Y -To this end the main and primary object of the present invention is to construct certain improvements in feed water heating gratas to render grates of this character much more eflicient in their use, while atthe same time easier of manipulation. T

With these and other objects in View which will readily appear as-the nature of the invention is better understood, the same con sists in the novel construction, combination and arrangement of parts hereinafter more fully described, illustrated and claimed. y

In the accompanyingdrawingsz-Figure l is a horizontal sectional view of the lire box end of a steam boiler furnace, showing my improved grate bars and the connections thereof properly arranged in position. Fig. `2 is a sectional View on the line aux of Fig. 1.

Referring to the accompanying drawings, A represents the fire-box end of a steam boiler furnace of the ordinary construction and having mounted therein the ordinary boiler B, a portion of which is illustrated in the drawings.

Arranged transversely within the fire-box of the furnace are a series of grate supporting bars C, upon which is arranged thel horizontal hollow grate coil D. The grate coil D, which is thus supported horizontally in position within the fire-box of a steamboiler furnace, comprises a series of parallel hollow grate bars or pipes E, connected at their ends by the return bends F, so that there is a free and uninterrupted circulation throughout the sev-y The said water supply pipe G is connected to the ordinary feed pump employed for pumping feed water into a steam boiler, and the same is provided with a check valve I-l, to prevent the return flow of water from the grate coil, and at a point between such check valve and the grate coil with a globe valve l, of the ordinary construction.

A- nipple connection J, is connected to the end of the grate coil D, opposite the connection of the supply pipe G, therewith, and such nipple connection connects to such coil the boiler feed pipe K, which leads to and is connected with the steam boiler B, at one side thereof, and said boiler feed pipe K, is pro vided at a point near its connection with the boiler with a valve L,\vhicl1 is designed to control the admission of waterinto the boiler from the pipe K. At a point intermediate of the connection of the pipe K, with the boiler and with'the grate coil, a blow-od pipe M, is connected thereto and is provided with a valve N, by means of which the said blow-olf pipe may be controlled for blowing out the hollow grate coil or for leading the heated water to any desired point of use, when the boiler is not being fed.

An auxiliary supply pipe O, is connected at one end to the supply pipe G, between the valves H and I, and is connected at its other end to one side of the boiler B, opposite the connection of the pipe K, and said auxiliary pipe O, is provided at a point near its connection with the boiler with a valve P,where by circulation through said pipe may be reg ulated as desired. The pipe O, is intended to provide means for maintaining a continuous circulation of water through the grate coils when the boiler is not being fed, or to serve in the capacity of a feed or supply pipe in case the grate coil should happen to leak and repairs were necessary.

' When water is being pumped into the steam boiler in the ordinary manner, the valves I, and L, are the only valves which are open, so that, as the pump continues to operate, the water is forced through the supply pipe G, and is caused to circulate throughout the several pipes of the hollow grate coil, thereby providing means for heating up the feed water to a very high degree before it enters the boiler through the pipe K, and consequently IOO causing a saving in the fuel necessary to run the furnace. In case Water is not being pumped into the boiler, the valve P is opened in addition to the valves lI, and L, in order to provide for a continuous circulation of water fromthe boiler through the grate coil, which not only assists in the generation of steam, but necessarily preserves the grate bars from being destroyed. An important point of advantage relative to the pipe O, is to be observed in that in case any of the hollow grate bars should leak, the valves I and L, can be closed to cut off any circulation through the grate coil, and the valveP opened so that the supply of water can flow directly into the boiler Withoutinterrupting the same and stopping to repair the coil.

When it is desired to blow out the hollow grate bars, the valve L, is closed and the valves P, I, and N, opened.

It will of course be understood that any necessary auxiliaries may be used in connection with the apparatus described to render the same effective, such for instance as the employment of drain cocks or valves which may be connected to either end of the grate coil for the purpose of draining the same from the water and sediment therein when so desired, and 1 will have it also understood that other changes in the form,proportion and the minor details of construction maybe resorted to without departing from the principle or sacrificing any of the advantages of this invention.

Having thus described the invention, what is claimed, and desired to be secured by Letters Patent, is

The combination with a steam boiler furnace of a suitably supported horizontal grate coil adapted to be arranged.in the furnace fire-box and comprising a series of parallel hollow grate bars or pipes connected at their ends by return bends, a water supply pipe connected to one end of said coil and provided with a check and a globe valve the latter valve being located next to the grate coils, a boiler'feed pipe connected at one end to the grate coil and at its other end to one side of the boiler in the furnace, said boiler feed pipe being provided with a valve, a valved blowoff pipe connected to the boiler feed pipe intermediate of its ends, and an auxiliary water supply and circulating pipe O connected at one end to the main supply pipe between its valves and at its other end to one side of the boiler, said-auxiliary pipe being also provided with a valve and being adapted, in conjunction with the globe valve of the main supply pipe, to provide means for a continuous circulation from the boiler through the coil, and also for the direct supply of water to the boiler in the event of impairment of the coil, substantially as set forth.

In testimony that I claim the foregoing as my own I have hereto aixed my signature in the presence of two witnesses.

GEORGE H. RANDOLPH.

Witnesses:

W. R. STALIoNs, JOHN A. STALIoNs. 

